Pigtail connection.



w. SHAW.

PIGTAIL CONNECTION.

APPLICATION FILED AUG.6. 1-912.

Patented June 27, 1916.

FIG. 6.

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lNViEN'lOR VVlLL-IAM SHA BY 091a WITNESSES ZJW,

ATTORN BY UNITED STATES PATENT OFFICE.

' WILLIAM SHAW, OF LAKEWOOD, OHIO, ASSIGNOB T0 NATIONAL CARBON COMPANY,

OI: CLEVELAND, OHIO, A CORPORATION OF NEW JERSEY.

mourn commcrron.

To all whom it ma concern:

Be it known t at 1, WILLIAM SHAW, a resident of Lakewood, in the county of Guyahoga, in the State of Ohio, have invented new and useful Improvements in Pigtail Connections, of which the following is a clear and exact description.

This invention relates to brushes and to the fastening 'of the pig-tail thereto.

One, object of the invention is-to firmly secure the pigtail to the brush so that there will be minimum contact resistance.

Another object is to secure the pigtail to the brush in such manner that it can not work loose in practice, but to arrange it so that it may be removed and attached to another brush when the first brush is no longer serviceable.

@ther objects will appear in the appended description.

In the drawings: Figure 1 is a view of a brush having a pigt-ail connected in accordance with my invention. Fig. 2 is a view of the back side of the brush shown in Fig.

e 1. Fig. 3 is a section taken in the plane A-A of Fig. 1. Fig. 4 is a top View of a brush in which the pigtail extends through a hole in the top. Fig. 5 is a section or" a brush having a metallic cup at one end of the connection. Fig. 6 is a section of a brush having a metallic cup at both ends of the connection. Fig. 7 is a view of the nut with the lug to prevent it from turning. Fig. 8 is a view of the bent wire used to prevent the screw connection from loosening. Fig. 9 is a view of the metal cup.

Referring to Figs. 1, 2 and 3, a hole is I drilled or otherwise formed in a brush 1 and the two ends are counterbored as at 2 and 3. A groove 4 extends from the counterbore 2 to the top to receive the pigtail so that the connection will not interfere withthe brush moving freely in the brush holder.

One end of the pigtail is coiled around in the counterbore 2 and a screw 6 is inserted in the hole to extend, through the coiled end. A 'nut 7 having a lug is placed in the counterbore with the lug extending into the groove 4. The screw 6 is then turnedto screw into. the nut 7 and tightly compress the end of the pigtail against the bottom of the counterbore. Diverging holes 8 are drilled in the brush so as to lie in the plane of the slot in the screw head. A wire 9'. is bent somewhat into U-shaped form as shown D Specification of we. Patent. Application filed August 8, 1912. Serial No. 718,570.

Patented June 27, 1916.

in Fig. 8 and is then driven or pressed into the holes with the middle portion in the slot of the screwheada The lug on the nut 7 prevents it from turning and the wire in the slot prevents the screw from turning so that the connection cannot work loose. The

wire 9 bends to conform to the shape of the holes 8 in the driving process and cannot come out. When the brush is worn out the connection can be readily removed by breaking the brush. The pigtail and the other parts can be used again in another'brush.

In Fig. ia hole or channel 10 is drilled to extend into the counterbore. This serves the same purpose as the groove or channel 4. in Fig.1.

In some cases it may be desirable to put a close fitting cup 11 in the'counterbore as shown in Fig. 5.- This cup has a slot 12 to receive the lug on the nut 7. The head of the screw in Fig. 5 is beveled and the counterbore is beveled to fit it.

Iii-Fig. 6, cups 11 are used in both counterbores. The connection is otherwise the same as in the other figures.

This invention is obviously not limited to a particular form of pigtail. The term pigtail as used in the specification and claims is intended to refer to any type.

Having described my invention what I claim is:

1. In current collectors, a brush, a screw having a slotted head, a nut engaging the screw, a pigtail secured to the brush by the said screw and nut, and a U-shaped member in said slot having diverging ends extending into the brush to prevent it from turning.

2. In current collectors, a brush having a hole therethrough, one end of the hole being enlarged, a channel leading into the hole, a pigtail extending through the channel into the hole, a nut having a lug extending into the channel, a screw in the hole engaging the nut and a bail fitting in the slot of the screw head and extending into the brush to prevent it from turning.

3. In current collectors, a brush having one transverse and two diverging) holes, one end of said first mentioned hole eing counterbored, a pigtail having one end-in the counterbore, a nut to hold the pigtail therein, a screw extending through the first mentioned hole and engaging the nut and a bail fitting in the slot of the screw head and extending into the diverging holes to prevent In testimony whereof I have hereunto said screw from turning. signed my name. v

4. In current collectors a brush having a hole therethrough one end of the hole being WILLIAM bHAW' eounterbored, e metal cup in the counterbore, Witnesses: a igtail havmg one end in the cup and HENRY KWILUS,

' means to hold the pigtail and cup in place. J. H. CROSBY. 

